[texhax] Images just come up as box with image name inside

[Jack Lonsdale]

I am having trouble getting images to appear in my pdf file. Currently I
am using the graphicx package with the pdftex option. 

I am using the following:
\begin{figure}
	\begin{center}
		\includegraphics[width=150mm]{quesnel_aac.png}
	\end{center}
\caption{Past (1981-2009) AAC for the Quesnel TSA. Source:
\citealt{pedersen04}}
\end{figure}

But all that displays in the pdf is a box outline of the image and the
filename inside the box.